Delgenius™ Shelby Delphinium

Delphinium 'Delgenius Shelby'

$38⁹⁰

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Plant Size

#1 Container

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Understanding Plant Options

Nature Hills offers plants in two main formats:

Container Plants: Grown in pots with soil, sized by container volume and plant age
Bare Root Plants: Dormant plants without soil, sized by height measurements

Container Plant Sizes

Container sizes indicate plant age and growing capacity rather than liquid volume equivalents. Our containers follow industry-standard nursery "trade gallon" specifications, which differ from standard liquid gallon measurements.

Young Plants (6 months to 18 months old)

Container Size	Actual Volume	Metric Equivalent
2" x 2" x 3"	0.18 - 0.21 dry quarts	0.20 - 0.23 dry liters
4" Container	0.31 - 0.87 dry quarts	0.35 - 0.96 dry liters
4.5" Container	0.65 dry quarts	0.72 dry liters
6" Container	1.4 dry quarts	1.59 dry liters
1 Quart	1 dry quart	1.1 dry liters
5.5" Container	1.89 dry quarts	2.08 dry liters

Established Plants (18 months to 2.5 years old)

Container Size	Actual Volume	Metric Equivalent
2 Quart	2 dry quarts	2.2 dry liters
#1 Container	2.26 - 3.73 dry quarts	2.49 - 4.11 dry liters
5" x 5" x 12"	3.5 - 4.3 dry quarts	3.85 - 4.74 dry liters

Mature Plants (2-4 years old)

Container Size	Actual Volume	Metric Equivalent
#2 Container	1.19 - 1.76 dry gallons	5.24 - 7.75 dry liters
#3 Container	2.15 - 2.76 dry gallons	8.14 - 12.16 dry liters

Large Plants (3-5 years old)

Container Size	Actual Volume	Metric Equivalent
#5 Container	2.92 - 4.62 dry gallons	12.86 - 20.35 dry liters
#6 Container	5.25 - 6.01 dry gallons	23.12 - 26.42 dry liters
#7 Container	5.98 - 6.53 dry gallons	26.34 - 28.76 dry liters

Bare Root Plants

Bare root plants are sold by height from the root system to the top of the plant. Plants may exceed minimum height requirements.

Common Sizes:

Trees: 1 foot, 2 feet, 3 feet, 4 feet, 5 feet, 6 feet
Shrubs & Perennials: 1 foot, 18 inches, 2 feet

Important Notes

Container Volume Specifications

Trade Gallon Standard: Our containers follow industry-standard "trade gallon" specifications established by the American National Standards Institute (ANSI Z60.1) for nursery stock
Volume Variations: Actual soil volume may vary due to plant root systems and growing medium settlement
Age Indicators: Container size primarily indicates plant age and maturity rather than liquid volume equivalents

Growing Conditions

Plant size can vary based on variety and growing conditions
Container size helps indicate plant maturity and establishment level
Larger containers generally mean more established root systems and faster landscape establishment

Seasonal Availability

Bare root plants are available seasonally when dormant
Container plants are available throughout the growing season
Specific varieties may have limited availability in certain sizes

Questions?

For questions about specific plant sizes or availability, please contact our plant experts who can help you choose the right size for your landscape needs.

Plant Profile & Growing Essentials

Cold hardy, Compact/Dwarf, Flowering, Reblooming, Deer-resistant, Attracts pollinators, and Container Friendly

Specifications

Botanical Name

Delphinium 'Delgenius Shelby'
Height

1-2 ft
Width

1-2 ft
Growing Zones

3-9
Sunlight
- Full sun
Growth Rate

Moderate
Flower Color
- Blue
- Purple
Leaf Color
- Green
Pollinator Friendly

Yes
Bloom Period

Late Spring, Early Summer, Late Summer
Does Not Ship To

AK, HI, ID, MT

Planting & Care Instructions

Where to Plant

Sunlight: Provide at least 6 hours of direct sunlight daily to ensure strong stems and the most vibrant purple blooms. While full sun is best, gardeners in hotter zones (7 and 8) may find that some afternoon shade helps the plant perform better during peak summer heat.
Soil: These plants crave rich, porous soil that drains well, as sitting in waterlogged soil is the quickest way to kill them. If you have heavy clay or sandy soil, amend it generously with compost to improve drainage and hold the right amount of moisture.

Watering Requirements

Keep the soil consistently moist during the first season to help the roots establish, checking it daily in hot weather. Even after establishment, Delphiniums are not drought-tolerant and require regular watering to support their lush foliage and large flower spikes. Inconsistent moisture can lead to plant stress, resulting in stunted blooms or issues with powdery mildew.

Pruning Tips

Deadhead the spent flower spikes immediately after the first flush of blooms fades to encourage a potential second wave of flowers later in the season. According to your growing zone data, you should perform a hard cleanup in late fall. Cut the entire plant back to the ground once the foliage has yellowed or died back after the first hard frost to keep the garden tidy for winter.

Fertilizer Needs

Because they expend so much energy producing large flowers, apply a balanced, slow-release fertilizer or a layer of compost in early spring as new growth emerges. Avoid high-nitrogen fertilizers, often used for lawns, as these promote weak, leafy growth rather than the strong flower spikes you want.

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Growing Zones 3-9

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Proven Winners® Delgenius™ Shelby Delphinium

Gorgeous packed spires, the Delgenius™ Shelby Delphinium PP#34657 (Delphinium 'Delgenius Shelby') is a spectacular reblooming perennial known for its brilliant deep blue blooms with full, densely packed flower spikes. Rising high on tall sturdy stems over a mound of lacy deeply incised green foliage, these are eye-catching blossoms!

A standout in the Delgenius™ series, Shelby combines superior branching, heat tolerance, and cold hardiness, making it an excellent choice for gardens across many climates. Unlike traditional Delphiniums, Shelby offers continuous blooms from early summer to fall with a compact, sturdy form that requires no staking.

>>Jump to Planting & Care Instructions

Key Features of Delgenius™ Shelby Delphinium

Stunning deep blue blooms on tall, full flower spikes.
Extended bloom season, reblooming from early summer to fall.
Superior branching habit for maximum flower production.
Compact and sturdy, reaching 24-30 inches tall with no need for staking.
Cold hardy to USDA growing zones 3-9, are heat tolerant and widely adaptable.
Pollinator-friendly, attracting butterflies and bees.
Perfect for cut flowers with long-lasting blooms.
Deer and rabbit resistant for worry-free planting.

How to Use Delgenius™ Shelby Delphinium in the Landscape

Cottage Gardens & Perennial Borders

Plant Shelby in mixed borders to add vertical interest and bold color.
Combine with Roses, Coneflowers, or Coreopsis for colorful Cottage Gardens.
Use in mass plantings for a striking visual impact throughout the growing season.

Pollinator Gardens

Attract butterflies and bees with Shelby's nectar-rich blooms.
Include it in pollinator-friendly landscapes for season-long beauty and ecological benefits.

Container Gardening & Patio Displays

Shelby's compact habit makes it perfect for large containers.
Place on patios or decks to enjoy its vibrant blooms up close.

Cut Flower Gardens

Its tall, sturdy stems make it an ideal addition to fresh bouquets.
Cut back after the first bloom to encourage additional flowers for later in the season.

Delphinium Care & Maintenance

Delphinium are very easy to grow and hardy perennial plants!

Sun & Soil Requirements

Grows best in full sun to partial shade. Ensure at least 6 hours of direct sunlight for optimal blooms. Hot climates will find their plants do better with afternoon shade.
Prefers an enriched, well-drained soil with consistent moisture.

Watering & Mulching

Keep soil evenly moist, especially during hot, dry periods.
Add 3-4 inch layer of mulch around the base to help retain moisture and regulate temperature.

Fertilizing

Apply a balanced, slow-release fertilizer in early spring and again after the first bloom to promote continuous flowering.

Pruning & Deadheading

Deadhead spent blooms to encourage reblooming.
After the first flush of flowers, cut back the flower stalks to promote a second bloom cycle.

Winter Care: Shelby is cold hardy! Apply mulch or compost over the area in late fall to protect the root zone during harsh winters.

Order Delgenius™ Shelby Delphinium Today!

Bring vivid color and vertical beauty to your garden with Delgenius™ Shelby Delphinium. With its extended bloom season, compact habit, and reliable performance, Shelby is a must-have for any perennial garden.

Order now from Nature Hills Online Plant Nursery, and enjoy months of stunning blooms and low-maintenance beauty in your landscape!

Frequently Asked Questions About Delgenius™ Shelby Delphinium

How tall does Delgenius™ Shelby Delphinium grow?

Shelby grows to 20-24 inches tall and spreads to about 16-20 inches wide, making it easy to include in mixed borders, mass plantings, and containers.

When does Delgenius™ Shelby Delphinium bloom?

It blooms continuously from early summer through fall, with a second bloom cycle after deadheading.

Is Delgenius™ Shelby Delphinium deer-resistant?

Yes! Delgenius™ Shelby is resistant to deer and rabbits, making it a great choice for gardens with wildlife pressure.

Can I grow Shelby in a container?

Absolutely! Shelby's compact, sturdy form makes it perfect for patio pots and large containers.

How do I promote continuous blooming?

Deadhead spent blooms and cut back flower stalks after the first bloom to encourage a second flush of flowers later in the season.

Is Delgenius™ Shelby Delphinium easy to grow?

Yes! Shelby is widely adaptable, low-maintenance, and more heat-tolerant than traditional Delphiniums.

Under $50	$9.99
$50 - $99.99	$14.99
$100 - $149.99	$16.99
$150 - $198.99	$24.99
$199+	FREE

Delgenius™ Shelby Delphinium

Delphinium 'Delgenius Shelby'

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